Olivier Bonaventure writes: The TCP protocol is closely coupled with the underlying IP protocol.Once a TCP connection has been established through one IP address,the other packets of the connection must be sent from this address. Thismakes mobility and load balancing difficult. Multipath TCP isa new extension that solves these old problems by decoupling TCP fromthe underlying IP. A Multipath TCP connection can send packets overseveral interfaces/addresses simultaneously while remaining backwardcompatible with existing TCP applications. Multipath TCP has several usecases including smartphones that can use both WiFi and 3G or serversthat can pool multiple high-speed interfaces. Christoph Paasch, GregoryDetal and their colleagues who develop the implementation ofMultipath TCP in the Linux kernel have achieved 50 Gbps for a single TCPconnection by pooling together six 10 Gbps interfaces. See here fortechnical details and full source code.

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